One of the mysteries of the English language finally explained.
A small-bore rifle barrel that can be inserted in a large-bore rifle or shotgun for shooting practice.
Late 19th century; earliest use found in Army General Orders. From the name of Richard Morris (d. 1891), the inventor, who patented the barrel in 1881 + tube.
Morris tube/ˈmɒrɪs tjuːb//ˈmɒrɪs tʃuːb/
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